Go Back   Horizons Unlimited - The HUBB > Technical, Bike forums > BMW Tech

BMW Tech BMW Tech Forum - For Questions specific and of interest to BMW riders only. Questions comparing which bike is best etc go in the "Which Bike" forum.
Contact Overland Solutions for all your custom modifications and setup for overland travel.

7 Litre Camel Tank Lets You Explore More, Click to Find out More!

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 10 Jul 2011
Registered Users
Veteran HUBBer
 
Join Date: Jan 2003
Location: Kas,Antalya
Posts: 145
1995 R80GS MPG and points to look for

Hi Beemer folk,

I'm currently looking at a 1995 R80GS in very tidy nick. Petrol here in Turkey is very expensive therefore MPG is a consideration. Ridden steadily what MPG could I hope to achieve? Also, are there any known weak points I should be looking out for?

Thank you very much.

Cheers,

Dicky

Last edited by Dicky; 10 Jul 2011 at 15:32.
Reply With Quote
  #2  
Old 10 Jul 2011
Registered Users
HUBB regular
 
Join Date: May 2010
Location: France
Posts: 44
I have a 94 which returns 45-60 mpg depending on how it is ridden. High revs really sucks the fuel.

Crossing Africa rarely exceeding 50 mph 2 up we regularly got 60+ on good fuel


75-80mph and it's down to 50

Cane it and start doing 6k revs a lot and it drops dramatically
Reply With Quote
  #3  
Old 10 Jul 2011
Donmanolo's Avatar
Registered Users
Veteran HUBBer
 
Join Date: Nov 2004
Location: Weird north East bit of Italy
Posts: 251
We don't know much about imperial measures down here, but my 1983 R 80 G/S (same engine) gets nearly 20 km/Litre, if I take it very easy (meaning by puttering around the countryside at 80km/h max)

Anywhere near a town that drops quite a lot. in any kind of stop start traffic it can easily go down to around 16.5 km/L.

My average is actually somewhere between both figures, usually 2 up, on long journeys and not going too slowly. Usually this means hitting reserve after around 280 km, with my 19L tank
Reply With Quote
  #4  
Old 11 Jul 2011
Registered Users
Veteran HUBBer
 
Join Date: Oct 2002
Location: Stockholm - Sweden
Posts: 316
The 800cc version is the most thirsty of all the air-cooled beemer models...

There are claims that their 800cc engine use about 0.45-0.5L/10km, but to faire... I still have to see an 800cc use that little gas...

My R80 1984 used more than 0.8L/10km when I bought it from the police. The best mileage that I have managed to get out of it is 0.57L/10km. When I did get this mileage I had 44/40 highflow valves, lowered the heads by about 0.8mm (=> about 10.3:1 compression ratio), dual ignition.

What did make a significant change was the installation of the HPN 5th gear sprocket. It resulted in about 0.02-0.03L/10km less consumption.

Here is the thing.
1000cc will use less fuel in most instances - since it revs less, and need less energy thanks to the far higher torque. The newer like the one you look at have 8.2:1 compression ratio, which allows for less good fuel. The down-side is that lower compression ration will result in higher fuel consumption...

You should anticipate that the 800cc will use anything between 0.5L/10km to 0.7L/10km at 90km/h constant speed on a "autobahn". You should not accept higher milage than 0.6L/10km, but if the bike uses more... it will most likely take a lot of work to find the causes and correct them. I 've spent over one decade (>10 years) trying to figure out why my 800 is so darn thirsty. Bought it in 1991 - I've still searching for the reason/causes...

Remeber that the petrol cools the valves and seats, so should you get the bright idea to install smaller jets... it will be best to carry a spare engine...

Looking at your question and that you do point-out that the petrol cost is an issue, I will have to recommend that you look at water-cooled engines since these usually runs at a far better mileage than the air-cooled.

Changing the bing-carbs to throttle carbs like Dell'Ortos 34, Mikuni 34 or Keihan 34 for the 750-800cc series will result in far better milage. You can expect 0.1L/10km improvement. With tuning it is reasonable to achive up to about 0.15L/10km improvement over the bing-carbs. Side-effect is much better gas-respons, enginebraking and idle. Down-side - quite a bit of work to install... there is a wire-split under the tank... the throttle lift is not large enough (I modified my system and still I get only about 80% lift of the throttle).
K&N air-filter will give about 0.01L/10km improvement over the stock paper airfilter; but,... if you drive in dusty/sandy areas... you ought to only use the paper air-filters(!)...
__________________
Drive Safely,
Albert
Reply With Quote
  #5  
Old 11 Jul 2011
Registered Users
Veteran HUBBer
 
Join Date: Jan 2003
Location: Kas,Antalya
Posts: 145
Thank you for your very much for your replies and Albert for a particularly useful analysis.

I currently have a couple of old Yamaha 600's and one of the newer XT660R's with fuel injection. In light of what has been said I will be staying with the XT660R for distance touring.

Thanks again for taking the time.

Cheers,

Dicky
Reply With Quote
  #6  
Old 12 Jul 2011
Registered Users
New on the HUBB
 
Join Date: Apr 2010
Location: Turkey
Posts: 3
Quote:
Originally Posted by Dicky View Post
Hi Beemer folk,

I'm currently looking at a 1995 R80GS in very tidy nick. Petrol here in Turkey is very expensive therefore MPG is a consideration. Ridden steadily what MPG could I hope to achieve? Also, are there any known weak points I should be looking out for?

Thank you very much.

Cheers,

Dicky
Hello David,

I jointly own and run Bike Turkey in Gocek Bike Turkey Home, if you need a good mechanic for the BM, there is a great guy in Fethiye - he does all our BM's - even the new one's.

Robert
robert@bike-turkey.com
Reply With Quote
  #7  
Old 12 Jul 2011
Registered Users
Veteran HUBBer
 
Join Date: Oct 2002
Location: Stockholm - Sweden
Posts: 316
Hi Dicky,

I really like the old Yamaha XT600. Quite fuel efficient. Good engine power. Does well on longer trips.

The newer XT660 is said to have some irritating down-sides, and to be more thirsty. That could be just bad talk, but I've heard it from all continents and all ages of drivers...

I would choose to stick to the old XT600 and to do the appropriate tune-ups like an oil-cooler, wind-defectors/collectors (for cooling the engine and keeping the driver from too much draught.

However... this is a BMW side, so... I'm way off topic!

The beemers are very good bikes. Some modifications and they are excellent. The costs vary from moderate to less comfortable costs... If I recall correctly the XT600 weighs in at around 170kg wereas the all stripped down beemers starts at 220kg - those 50kg is a lot of load once the bike tips over (which bikes do have a nasty tendency of doing...).
My R80 tips the scale at around 270-280kg...
__________________
Drive Safely,
Albert
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 Registered Users and/or Members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
50 Points Should Have To Be Seen coupleriders.net Travellers Seeking Travellers 1 17 Jan 2010 16:38
GPS Points steveindenmark Europe 1 24 Jun 2009 23:24
GPS points outthere sub-Saharan Africa 2 2 Dec 2007 08:03
GPS points outthere Route Planning 0 1 Dec 2007 06:29
GPS Points ALGERIE Hannes Sahara Travel Forum 3 13 Dec 2001 05:22

 
 



Renedian Adventures

HU DVD Summer Special!

Now that summer is here, get On the Road! Take 30% off the Achievable Dream - On the Road! 2-DVD set until August 31 only. Get On the Road! Learn the tips to staying healthy, happy and secure on your motorcycle adventure!

Our veteran travellers share their tips (and great stories) for staying healthy, happy and secure on your motorcycle adventure.

"A fantastic, informative and inspirational DVD."

"It's brilliant - thank you very much!"

Check it out at the HU Store! Remember to use Coupon Code 'ONTHEROAD' on your order when you checkout.

What others say about HU...

"I just wanted to say thanks for doing this and sharing so much with the rest of us." Dave, USA

"Your website is a mecca of valuable information and the DVD series is informative, entertaining, and inspiring! The new look of the website is very impressive, updated and catchy. Thank you so very much!" Jennifer, Canada

"...Great site. Keep up the good work." Murray and Carmen, Australia

"We just finished a 7 month 22,000+ mile scouting trip from Alaska to the bottom of Chile and I can't tell you how many times we referred to your site for help. From how to adjust your valves, to where to stay in the back country of Peru. Horizons Unlimited was a key player in our success. Motorcycle enthusiasts from around the world are in debt to your services." Alaska Riders

contest pic

10th Annual HU Travellers Photo Contest is on now! This is an opportunity for YOU to show us your best photos and win prizes!

NEW! HU 2014 Adventure Travel T-shirts! are now available in several colors! Be the first kid on your block to have them! New lower prices on synths!

HU 2014 T-shirts now in!

Check out the new Gildan Performance cotton-feel t-shirt - 100% poly, feels like soft cotton!


What turns you on to motorcycle travel?


Global Rescue, WORLDwide evacuation services for EVERYONE

Global Rescue is the premier provider of medical, security and evacuation services worldwide and is the only company that will come to you, wherever you are, and evacuate you to your home hospital of choice. Additionally, Global Rescue places no restrictions on country of citizenship - all nationalities are eligible to sign-up!


New to Horizons Unlimited?

New to motorcycle travelling? New to the HU site? Confused? Too many options? It's really very simple - just 4 easy steps!

Horizons Unlimited was founded in 1997 by Grant and Susan Johnson following their journey around the world on a BMW R80 G/S motorcycle.

Susan and Grant Johnson Read more about Grant & Susan's story

Membership - help keep us going!

Horizons Unlimited is not a big multi-national company, just two people who love motorcycle travel and have grown what started as a hobby in 1997 into a full time job (usually 8-10 hours per day and 7 days a week) and a labour of love. To keep it going and a roof over our heads, we run events (22 this year!); we sell inspirational and informative DVDs; we have a few selected advertisers; and we make a small amount from memberships.

You don't have to be a Member to come to an HU meeting, access the website, the HUBB or to receive the e-zine. What you get for your membership contribution is our sincere gratitude, good karma and knowing that you're helping to keep the motorcycle travel dream alive. Contributing Members and Gold Members do get additional features on the HUBB. Here's a list of all the Member benefits on the HUBB.


Books & DVDs

amazon

All the best travel books and videos listed and often reviewed on HU's famous Books page. Check it out and get great travel books from all over the world.


Motorcycle Express for shipping and insurance!

Motorcycle Express

MC Air Shipping, (uncrated) USA / Canada / Europe and other areas. Be sure to say "Horizons Unlimited" to get your $25 discount on Shipping!
Insurance - see: For foreigners traveling in US and Canada and for Americans and Canadians traveling in other countries, then mail it to MC Express and get your HU $15 discount!




All times are GMT +1. The time now is 15:59.